Ignition-timer



E, BvlACOBS ON. IGNITION TIMER. APPLICATION FILED 8 28,1919.

1,383,263 Patented June 28, 1921.

W1 TNESSES v [N VENTOR) m. K? l w- I ATTOR Y OF BIT'ISFIELD,v

' IGNITION-TIMER.

Specification of Letters Patent. Patented 1111 328, 1921.

Application filed February 28, 1919. Serial No. 279,743.

To all whom z't'mag concern:

. Beit known that I a citizen of the United States, residing at State of Massachusetts,

pa'ratus, andhas for its object the provision of improvements in self-lubricating means carried bythe rotor which will adequately lubricate the course of the rotor contact and avoid 'gumming, poor circuit connections and other evils commonly caused by the excesslve use of fiuid lubrica'nts A further objectis the provision of means to prevent arcing of Figure 1Jis a longitudinal vertical section of" 7 an ignitlon 131K161 the electric current between the contactor carried by therotor and the several contactelements mounted in'the casing.

Referring to. the accompanying drawings,

embodying the present invention'in its preferred form operatively mounted upon a'cam-shaft; Fig. 2, a crosssection of the same on a line intermediate the rotor portion and the face of the hous ing; Fig. 8, av sideelevation of the rotor portion, the contact-arm being shown in section; and Fig. rotor portion.

The mechanism herein illustrated is designed for use in connection with a fourcylinder explosive engine having a geardriven cam-shaft operated by the mam engine shaft, but it should be understood, however, that my inventionis, susceptible of application with slight modification, to motors having any other number ofexplosion cylinders, and and driven. v

This invention may be adapted to any suitable form of housing or casing, the easing -1 herein illustrated being adjustably mounted on the front of theengine housing 2 and arranged to inclose the front end of a caln s'h aft 3, which is preferably geared to'the main engine shaft (not shown) and extends through 'asuitable opening in the may be, otherwise mounted wall of the englne' housing.

The rear end of the'casing l-is open and seated in a circular recess 4 provided on the face of the engine housing 2, said recess EDWARD B. JACOBSON,-

4:, a rear elevation of the being adapted to prevent eccentricdisplacement of the ca'sing.- Forward displacement of the casing is prevented preferably by a spring cla'mp 5 removably secured at its rear end to a stud or bolt 6 fixed to the wall of the engine housing 2, and, engaging at its opposite end the outer extremity of the reduced forward extension of the front of the outside of the casing 1, for connection with primary circult of separate lnduction' the coils. Mounted to rotate with the shaft 3 within the casing 1' is, a metallic carrier 13 in the form of a sleefie which isnormally secured againstrelative movement on the shaft by a transversely arrange-d removable'pin 14 projecting through a suitable opening in the shaft and extending at oneof its ends into a slot 15 provided on the outer rim of the carrier. The pin 14 is secured against endwis'e displacement by a cup washer-16 fitted over the outer'end of the carrier and inclos ing the exposed end of the pin-14, the reduced outer end'17 of the shaft being prov jected through the cup washer "1'6 and suitline to afford an even clearance at all points between its outer face and the inner rim. or

arm 21 is arranged to carry at its forward end a movable contactor 22 for slidably enetc, said forward end being arcuate inouttraveled surface of the ring 10. The contactgaging the inner rim 'of the ring 10,the outer end of the contactonbei'ng arcuate in outline to conform to the surface of the ring.

he contactor 22 preferably comprises a rectangular block of hardened steel adapted to move lengthwise in either direction within a slot of the same dimensions provided transversely in-the forward endof the contact arm and is provided with a round rearward extension 23 adapted to movably project into a bore 24 provided lengthwise in the body of the contact-arm and communicating with said slot in its forward end. Said extension 23 is provided with a reduced stem 25 which extends rearward through corresponding size in the rear wall 26 of the chamber withinthe contact-arm 21 formed by the bore 2 and beyond said walland carries. on its extremity in the rear of the contact-arm areniovable taper-pin 27 fittedv in a suitable transverse opening in the stem and adapted to operate as a stop for limiting the'forward movement of the contactor 22 and its rearward extension 23. Within the bore 24: and surrounding the stem 25 is arranged a coil expansion spring 28 confined.

by the extension 23 and the rear wall 26 and operating to urge the contactor 22 forward into constant engagement with the innerrim of the ring 10.

T'he outer end of the contactor 22 is provided centrally with a deep seated transverse slot extending across its face and adapted to be filled with a suitable solid lubricant 29 such as graphite composition for lubricating the inner rim of the ring 10 and the faces of the contact-elements 11, 11, etc. A lubricant of this description maintains a smooth even surface onthe traveled course of the insulation. ring 10 without adhering in large 'quantities or interfering an opening of with the operation of the several electrie'circuits, being adapted to effectually retard wear and to maintain aneven bearing surface for engagement with theco ntactor .22. The forward edge 30 of the contactor 22 is maintained in a sharpened state to cut through any particles of matter tending to accumulate and adhere upon the rim of the insulation ring 10. To avoid injurious arcing or sparking of the current passing between the contactor 22 and the several contact elements 11, 11, etc., each time the circuit is broken as the contactor 22 leaves a contact-element, I provide a facing strip 31 of fiber or other suitable insulation secured to the rear face of the contactor 22, which is cutaway for this purpose and providedwith a longitudinal groove for seating a corresponding tongue 32 provided on the inner side of the strip.

v I claim:

In. an ignition timer, the combination with a casing, contact-elements mounted in the casing, and a rotor portion mounted to rotate in the casing and having an arm ar ranged lateral to its axis, of a spring-pressed contactor carried by said arm and arranged to yieldingly successively, saidcontactor being provided at its outer end with a cutting edge formed .engage the contact-elements by the intersection at an acute angle of its bearing face with its front side and adapted to remove deposits adhering to the surfaces of the contact-elements.

EDWARD B. JACOBSON.

Witnesses:

LE ROY E. SHAW, J NO. J. WHI'ITLESEY. 

